package com.atguigu.gulimall.search.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.to.es.SkuEsModel;
import com.atguigu.common.utils.R;
import com.atguigu.gulimall.search.config.GulimallElasticSearchConfig;
import com.atguigu.gulimall.search.constant.EsConstant;
import com.atguigu.gulimall.search.feign.ProductFeignService;
import com.atguigu.gulimall.search.service.MallSearchService;
import com.atguigu.gulimall.search.vo.AttrResponseVo;
import com.atguigu.gulimall.search.vo.BrandVo;
import com.atguigu.gulimall.search.vo.SearchParam;
import com.atguigu.gulimall.search.vo.SearchResult;
import org.apache.commons.lang.StringUtils;
import org.apache.lucene.search.join.ScoreMode;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.NestedQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.RangeQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.Aggregation;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.Aggregations;
import org.elasticsearch.search.aggregations.bucket.nested.NestedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.nested.ParsedNested;
import org.elasticsearch.search.aggregations.bucket.terms.*;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

@Service
public class MallSearchServiceImpl implements MallSearchService {
    @Autowired
    private RestHighLevelClient client;
    @Autowired
    private ProductFeignService productFeignService;
    @Override
    public SearchResult search(SearchParam param) {
        //1、动态构建出查询需要的dsl
        SearchResult result=null;
        //1、准备检索请求
        SearchRequest searchRequest=bulidSearchRequrest(param);
        try {
            //2、执行检索请求
            SearchResponse response = client.search(searchRequest, GulimallElasticSearchConfig.COMMON_OPTIONS);

            //3、分析响应数据封装成我们需要的格式
            result=buildSearchResult(response,param);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }

    /**
     * 准备检索请求
     * #模糊匹配，过滤（按照属性，分类，品牌，价格区间，库存），排序，分页，高亮，聚合分析
     * @return
     */
    private SearchRequest bulidSearchRequrest(SearchParam param) {
        SearchSourceBuilder sourceBuilder=new SearchSourceBuilder();//构建DSL语句的
        /**
         * 查询：模糊匹配，过滤（按照属性，分类，品牌，价格区间，库存）
         */
        //1、构建bool - query
        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
        //1.1、must-模糊匹配
        if(StringUtils.isNotEmpty(param.getKeyword())){
            boolQuery.must(QueryBuilders.matchQuery("skuTitle",param.getKeyword()));
        }

        //1.2、bool - filter 按照三级分类查询
        if(param.getCatalog3Id()!=null){
            boolQuery.filter(QueryBuilders.termQuery("catalogId",param.getCatalog3Id()));
        }

        //1.2、bool - filter 按照品牌id查询
        if(param.getBrandId()!=null&&param.getBrandId().size()>0){
            boolQuery.filter(QueryBuilders.termsQuery("brandId",param.getBrandId()));
        }

        //1.2、bool - filter 按照所有指定的属性进行查询
        if(param.getAttrs()!=null&&param.getAttrs().size()>0){
            //attrs=1_5寸:8寸 & attrs=2_16G:8G

            for (String attrStr : param.getAttrs()) {
                BoolQueryBuilder nestedBoolQuery = QueryBuilders.boolQuery();
                //attrs=1_5寸:8寸
                String[] s = attrStr.split("_");
                String attrId=s[0]; //检索的属性Id
                String[] attrValues = s[1].split(":"); //检索的属性值
                nestedBoolQuery.must(QueryBuilders.termQuery("attrs.attrId",attrId));
                nestedBoolQuery.must(QueryBuilders.termsQuery("attrs.attrValue",attrValues));
                //每一个必须都得生产一个nested查询
                NestedQueryBuilder nestedQuery = QueryBuilders.nestedQuery("attrs", nestedBoolQuery, ScoreMode.None);
                boolQuery.filter(nestedQuery);

            }
        }

        //1.2、bool - filter 按照库存是否有进行查询
        if(param.getHasStock()!=null){
            boolQuery.filter(QueryBuilders.termQuery("hasStock",param.getHasStock()==1));
        }

        //1.2、bool - filter 按照价格区间
        if(StringUtils.isNotEmpty(param.getSkuPrice())){
            //1_500
            RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("skuPrice");
            String[] s = param.getSkuPrice().split("_");
            if(s.length==2){
                rangeQuery.gte(s[0]).lte(s[1]);
            }else if(s.length==1){
                if(param.getSkuPrice().startsWith("_")){
                    rangeQuery.lte(s[0]);
                }
                if(param.getSkuPrice().endsWith("_")){
                    rangeQuery.gte(s[0]);
                }
            }
            boolQuery.filter(rangeQuery);
        }

        sourceBuilder.query(boolQuery);

        /**
         * 排序，分页，高亮
         */
        //2.1、排序
        if(StringUtils.isNotEmpty(param.getSort())){
            String sort = param.getSort();
            //sort=hotScore_asc/desc
            String[] s = sort.split("_");
            SortOrder order=s[1].equalsIgnoreCase("asc")?SortOrder.ASC:SortOrder.DESC;
            sourceBuilder.sort(s[0], order);
        }

        sourceBuilder.from((param.getPageNum()-1)*EsConstant.PRODUCT_PAGESIZE);
        sourceBuilder.size(EsConstant.PRODUCT_PAGESIZE);


        if(StringUtils.isNotEmpty(param.getKeyword())){
            HighlightBuilder builder=new HighlightBuilder();
            builder.field("skuTitle");
            builder.preTags("<b style='color:red'>");
            builder.postTags("</b>");
            sourceBuilder.highlighter(builder);
        }



        /**
         * 聚合分析
         */
        //1、品牌聚合
        TermsAggregationBuilder brand_agg = AggregationBuilders.terms("brand_agg");
        brand_agg.field("brandId").size(50);
        //品牌聚合的子聚合
        brand_agg.subAggregation(AggregationBuilders.terms("brand_name_agg").field("brandName").size(1));
        brand_agg.subAggregation(AggregationBuilders.terms("brand_img_agg").field("brandImg").size(1));
        sourceBuilder.aggregation(brand_agg);

        //2、分类聚合
        TermsAggregationBuilder catalog_agg = AggregationBuilders.terms("catalog_agg").field("catalogId").size(20);
        catalog_agg.subAggregation(AggregationBuilders.terms("catalog_name_agg").field("catalogName").size(1));
        sourceBuilder.aggregation(catalog_agg);

        //3、属性聚合
        NestedAggregationBuilder attr_agg = AggregationBuilders.nested("attr_agg","attrs");
        TermsAggregationBuilder attr_id_agg = AggregationBuilders.terms("attr_id_agg").field("attrs.attrId").size(50);
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_name_agg").field("attrs.attrName"));
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_value_agg").field("attrs.attrValue"));
        attr_agg.subAggregation(attr_id_agg);
        sourceBuilder.aggregation(attr_agg);

        String s = sourceBuilder.toString();
        System.out.println("构建的DSL语句:"+s);

        SearchRequest searchRequest = new SearchRequest(new String[]{EsConstant.PRODUCT_INDEX}, sourceBuilder);
        return searchRequest;
    }

    /**
     * 构建结果数据
     * @param response
     * @param param
     * @return
     */
    private SearchResult buildSearchResult(SearchResponse response, SearchParam param) {
        SearchResult result=new SearchResult();
        //1、返回的所有查询到的商品
        SearchHits hits = response.getHits();
        List<SkuEsModel> esModels=new ArrayList<>();
        if(hits.getHits()!=null&&hits.getHits().length>0){
            for (SearchHit hit : hits.getHits()) {
                String sourceAsString = hit.getSourceAsString();
                SkuEsModel esModel = JSON.parseObject(sourceAsString, SkuEsModel.class);
                if(StringUtils.isNotEmpty(param.getKeyword())){
                    HighlightField skuTitle = hit.getHighlightFields().get("skuTitle");
                    String string = skuTitle.getFragments()[0].string();
                    esModel.setSkuTitle(string);
                }
                esModels.add(esModel);
            }
        }
        result.setProducts(esModels);


//        //2、当前商品涉及到的所有属性信息
        List<SearchResult.AttrVo> attrVos=new ArrayList<>();
        ParsedNested attr_agg = response.getAggregations().get("attr_agg");
        ParsedStringTerms attr_id_agg = attr_agg.getAggregations().get("attr_id_agg");
        for (Terms.Bucket bucket : attr_id_agg.getBuckets()) {
            SearchResult.AttrVo attrVo=new SearchResult.AttrVo();
            long attrId = bucket.getKeyAsNumber().longValue();
            //1、得到属性的Id
            attrVo.setAttrId(attrId);
            //2、得到属性名字
            ParsedStringTerms attr_name_agg = bucket.getAggregations().get("attr_name_agg");
            String attrName = attr_name_agg.getBuckets().get(0).getKeyAsString();
            attrVo.setAttrName(attrName);
            //3、得到属性的值
            ParsedStringTerms attr_value_agg = bucket.getAggregations().get("attr_value_agg");
            List<String> attrValues = attr_value_agg.getBuckets().stream().map(item -> {
                return item.getKeyAsString();
            }).collect(Collectors.toList());

            attrVo.setAttrValue(attrValues);


            attrVos.add(attrVo);
        }

        result.setAttrs(attrVos);
//        //3、当前商品所涉及到的所有品牌信息
        List<SearchResult.BrandVo> brandVos=new ArrayList<>();
        ParsedLongTerms brand_agg = response.getAggregations().get("brand_agg");
        for (Terms.Bucket bucket : brand_agg.getBuckets()) {
            SearchResult.BrandVo brandVo = new SearchResult.BrandVo();

            //1、得到品牌的Id
            brandVo.setBrandId(bucket.getKeyAsNumber().longValue());
            //2、得到品牌的名字
            ParsedStringTerms brand_name_agg = bucket.getAggregations().get("brand_name_agg");
            String brandName = brand_name_agg.getBuckets().get(0).getKeyAsString();
            brandVo.setBrandName(brandName);
            //3、得到品牌的图片
            ParsedStringTerms brand_img_agg = bucket.getAggregations().get("brand_img_agg");
            String brandImg = brand_img_agg.getBuckets().get(0).getKeyAsString();
            brandVo.setBrandImg(brandImg);
            brandVos.add(brandVo);
        }
        result.setBrands(brandVos);
//        //4、当前品牌所涉及到的所有分类信息
        Aggregations aggregations = response.getAggregations();
        ParsedLongTerms catalog_agg = aggregations.get("catalog_agg");
        List<SearchResult.CatalogVo> catalogVos=new ArrayList<>();
        List<? extends Terms.Bucket> buckets = catalog_agg.getBuckets();
        for (Terms.Bucket bucket : buckets) {
            SearchResult.CatalogVo catalogVo = new SearchResult.CatalogVo();
            //得到分类Id
            String keyAsString = bucket.getKeyAsString();
            catalogVo.setCatalogId(Long.parseLong(keyAsString));
            //得到分类名
            ParsedStringTerms catalog_name_agg = bucket.getAggregations().get("catalog_name_agg");
            String catalog_name = catalog_name_agg.getBuckets().get(0).getKeyAsString();
            catalogVo.setCatalogName(catalog_name);
            catalogVos.add(catalogVo);
        }
        result.setCatalogs(catalogVos);
//        ==================以上从聚合信息中获取======================
//        //5、分页信息-页码
        result.setPageNum(param.getPageNum());
//        //5、分页信息-总记录树
        long total = hits.getTotalHits().value;
        result.setTotal(total);
//        //5、分页信息-总页码
        Double totalPages=Math.ceil(total%EsConstant.PRODUCT_PAGESIZE);
        List<Integer> pageNavs=new ArrayList<>();
        for(int i=1;i<=totalPages.intValue();i++){
            pageNavs.add(i);
        }
        result.setPageNavs(pageNavs);
        result.setTotalPages(totalPages.intValue());


        //构建面包屑导航
        if(param.getAttrs()!=null&&param.getAttrs().size()>0){

            List<SearchResult.NavVo> collect = param.getAttrs().stream().map(attr -> {
                //分析每个attr传过来得到参数值
                SearchResult.NavVo navVo = new SearchResult.NavVo();
                String[] s = attr.split("_");
                navVo.setNavValue(s[1]);
                R r = productFeignService.attrInfo(Long.parseLong(s[0]));
                result.getAttrIds().add(Long.parseLong(s[0]));
                if(r.getCode()==0){
                    AttrResponseVo data = r.getData("attr", new TypeReference<AttrResponseVo>() {});
                    navVo.setNavName(data.getAttrName());
                }else{
                    navVo.setNavName(s[0]);
                }
                String replace = replaceQueryString(param, attr,"attrs");
                navVo.setLink("http://search.gulimall.com/list.html?"+replace);

                return navVo;
            }).collect(Collectors.toList());

            result.setNavs(collect);
        }
        if(param.getBrandId()!=null && param.getBrandId().size()>0){
            List<SearchResult.NavVo> navs = result.getNavs();
            SearchResult.NavVo navVo = new SearchResult.NavVo();
            navVo.setNavName("品牌");

            //TODO 远程查询所有品牌
            R r = productFeignService.brandsInfo(param.getBrandId());
            if(r.getCode()==0){
                List<BrandVo> brand = r.getData(new TypeReference<List<BrandVo>>() {
                });
                StringBuffer buffer=new StringBuffer();
                String replace="";
                for (BrandVo brandVo : brand) {
                    buffer.append(brandVo.getBrandName()+";");
                    replace=replaceQueryString(param,brandVo.getBrandId()+"","brandId");
                }
                navVo.setNavValue(buffer.toString());
                navVo.setLink("http://search.gulimall.com/list.html?"+replace);
            }
            navs.add(navVo);

        }
        //TODO 分类：不需要导航取消
        if(param.getCatalog3Id()!=null){

        }

        return result;
    }

    private String replaceQueryString(SearchParam param, String attr,String key) {
        String encode=null;
        try {
            encode = URLEncoder.encode(attr, "UTF-8");
            encode=encode.replace("+","%20");

        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return param.get_queryString().replace("&"+key+"=" + encode, "");
    }


}
